Signal-recorder.



L. J. VOORHEES.

SIGNAL RECORDER.

APPLICATION FlLED JUNE 3,1914.

Patented Nov. 7

wwm.

3 SHEETSSHEET I.

INVENTOH M ATTORNEY L. J. VOORHEES.

SIGNAL RECORDER.

APPLICATION FILED JUNE 3.1914

1 ,2U42 1 Q. Patented Nov. 7, 1916.

SHEETSSHEET 2.

IN l/E/VTOR z 4 WITNESSES:

L. J. 'VOORHEES SIGNAL RECORDER.

APPLICATION FILED JUNE 3.1914.

Patented Nov. 7', 1916.

3 $HEETSSHEET 3 WITNESSES:

rromvy a are LEE J. VOORHEES, OF BINGHAMTON, NEW,YORK-, ASSIGNOR, BYMESN E ASSIGNMENTS, TO THE GAMEWELL FIRE ALARM TELEGRAPH COMPANY, ACORPORATION OF NEW YORK.

SIGNAL-REG ORDER.

To all whom it may concern:

Be it known that 15, LEE J. VOORHEES, a citizen of the United States,residing at -Binghamton, in the county of 'Broome, and

State of New York, have invented a new and useful Signal-Recorder, ofwhich the following is a specification.

My improvement relates to electro-mag netically controlled signalrecorders and is particularly adapted for recording fire alarm, policeand other similar signals on a paper tape."

The objects of my invention are to provide a signal recorder positive inaction, requiring minimum operative energy, permanent in adjustment andcapable of economical manufacture, and'such other objects as arehereinafter specified and more particularly pointed out in the claims.

In constructing my invention, I provide an electro-magnetic escapementmechanism, a normally wound spring driven punching train and apropelling train actuated by the same motor spring, the cooperatingparts of the escapement mechanism and punching train being so arrangedthat the structure carried by the armature shaft will merely guide adetent bar, and thus not be subjected to the blow incident to stoppingthe mechanism, which bar, in turn, is mounted upon a separate shaft orpivot and is provided with ledges and is hereinafter referred to as aledge bar; the end of this bar being forked or slotted so as to permitrelative adjustment of the ledges after they have been suitably hardenedand to facilitate economical manufacture; a ledge arm being mounted upona shaft of the punching train and flexibly connected therewith, such armbeing adapted to engage with either of. the ledges carried by the ledgebar, the flexible connection between this revoluble ledge arm and theledge bar consisting of a spring of such tension that the blowoccasioned by the sud den stopping of the punching train will becushioned by said spring and a ratchet disk and pawl being provided soas to prevent undue rebound of the punching train as a result of thiscushioned stop.

The propelling train "is provided with suitable rollers for propellingthe material to be punched and with a detent arm engaging with a tootheddisk carried by a rela- Specification. of Letters Patent. Patented Nov,"Z, 1916,

Application filed June 3, 1914. 1 Serial No. 842,690.

controlled by an actuating plate frictionally connected with arelatively slow moving shaft of said train. Said detent arm and plateare connected by a link permitting some lost motion between them, aspring being so applied to the detent arm that when said arm is inposition to engage the toothed disk said spring will tend to hold saidarm in engagement. therewith, but when said arm is moved a certaindistance away from the toothed disk, said spring will not tend to returnthe arm into engagement with the toothed disk, the lost motion in theconnection between the arm and the actuating plate being such that whenthe plate has moved the arm toward the toothed disk to a point where thespring commences to act to swing the arm into engagementlwith thetoothed disk, said arm will be permitted to instantaneously move intoengagement with said toothed disk without further movement of the plate,and the direction of rotation of the shaft with which said plateisfrictionally connected being such as to move said plate in the directionwhich will tend to move the detent arm into engagement with the tootheddisk. The shaft of the punching train which carries the revoluble ledgearm is also provided with a pair of cams adapted to suitably influence aroller which is connected by a suitable arm with the frictionally drivendetent actuating plate and this shaft also drives a crank pin which isconnected by a suitable link with a punch bar so mounted as to beadapted to punch the material to be perforated; said cams and crank pinbeing so located with relation to each other and to the revoluble ledgearm that when said revoluble ledge arm is held by engagement with eitherof the ledges carried by the ledge bar, the crank pin will hold thepunch bar out of the path of the material to be perforated, and neitherof the cams will be in the path of theirco-engaging roller: but when thepunching train is permitted to act, by the disengagement of the ledgebar from the revoluble ledge arm, one of the cams will be carried acrossthe path of the roller in such relation thereto that if the detent armis at the time of such release out of engagement with its cooperatingtoothed disk, the action of this cam on the roller will result in somoving the actuating plate as to cause the detent arm to engage thetoothed disk, and the further movement of the punching train will causethe crank pin acting through its connecting link to drive the f punch'bar through the material to be perfora-ted and positively withdraw saidbar from said material, whereupon the further movement of the punchingtrain will bring the second cam into engagement with the roller andthereby through the actuating plate withdraw the detent arm from thetoothed disk and move said plate to a point with relation to the shaftof the propelling train with which it is frictionally connected fromwhich it will only be moved to cause reengagement of the detent arm withthe ing part of this specification, Figure 1 is a toothed disk aftersuch shaft has revolved a predetermined distance.

In the drawings accompanying and formside elevation of the gear trainsand controlling mechanism, with side plates re-' moved. Fig. 2 is anenlarged view of the propelling train detent. Fig. 3 shows the punchingand propelling mechanism, with the cover of the punching case removed.

Fig. 4 is an enlarged view of the punching train ledge arm andrestraining arm. Fig. 5 is an enlarged view of the ratchet mounted onthe ledge arm shaft and its c'o-acting pawl. Fig. 6 is a sectional Viewof the motor spring taken on the line X X of Fig.

1. Fig. 7 is a side elevation of the recorder. Fig. 8 is an enlargedsectional view of the punching mechanism'shown in' Fig. 3, taken on theline Y Y. Fig. 9 is an enlarged view of the ledge arm shaft for thepunching train shown in Fig. 1, and associated struc- "is pivoted at 5and carries the pin 6 near the free, end of the other arm thereof, whichpin 6 is adapted to engage with the ledge bar 7 which is pivoted at 8and provided with a slot 9 at its free end adapted to receive the pm 6.

2 j The ledges 10 and 11 are formed on oneside of the bar 7 and onopposite sides of the slot 9. adjacent to the point where'said slot isengaged bypin 6 and at different distances from the pivot 8.- The facesof the ledges 10 and 11 nearest to the pivot 8 are substantially atright angles with the slot 9 and extend substantially to the edges ofsaid slot. The face-of the ledge 11 nearest to the ledge- 10 is cut awayfor a purpose Well 1111- ment of said ledges without grinding them andthereby impairing or cutting through the casehardened surface. Thus, ifwarping of the part incidental to hardening results in unduly separatingthese ledges or distorts their relative position, they may be squeezedtogether, or twisted with relation to each other, while without thisslot, a part so warped would be-useless. The slot 9 fur ther facilitatesmanufacture inproviding a cutting clearance for tools employed informing the ledges and also furnishes convenient means of accuratelyobtaining desired relation between armature and ledges as the pin 6 maybereadily placed in fixed relation to the armature and being arranged towork in the slot 9 adjacent to said ledges assures a fixed relationbetween the armature and ledges in spite of any warping of the bar 7.incidental to hardening.

The ledges 10 and 11 should be hardened so that their operating faceswill not become battered or distorted due to the pounding upon themincident to the. operation of the mechanism, but it is preferable thatthe ledge bar should not be hardened throughout its entire length, butthe hardening should be confined to the ledges and their immediatevicinity or the temper should be drawn from the portion of the' barsurrounding the end of the slot-'9 nearest the pivot 8 so that the twoprongs of the fork formed by slotting the free-end of said bar will beadapted to relative adjustment by bending.

The punching train comprises the ledge arm shaft 12 driven by the pinion13 and having thereon.

\ The ledge 15 (see also 4) projects from orieside of the ledge arm 14in such position that it is adapted to be engaged by either of theledges '10, 11. A lug 16 proj ects from the opposite side of the ledgearm 14 and is adapted to be engaged by an arm carried by the shaft 12for causing the rota-. tion of said arm 14 with the shaft 12.

The restraining arm 17 is fixed upon the shaft 12 in such position thatthe sides of the notch 19 formed in said arm lie in the path of lug 16and thereby limit the rotation of the arm 14 with relation to the shaft12. I

, A spring 18 so connects the arms 14 and the ledge arm 14 looselymounted 17 as tend to move the arm 14 as far as the notch 19 will permitit to rotate with relation to the shaft 12 in the directi on in whichthe shaft 12 normally revolves. This spring should be of such strengthand tension that when the shaft 12 has made a complete revolution andthereby brought the ledge 15 against either the ledge 10 or the ledge11, said spring 18, while permitting the continued motion of theshaft-l2 and parts moving therewith after the rotation of the ledge arm14 has been arrested, will absorb the momentum of said shaft and movingparts within the distance which the notch 19 will permit said shaft 12to revolve after the rotation of arm 14 has been arrested, and thuscushion the stopping of said punching train. The ratchet dish 20 (seealso Fig. 5) is fixed upon the shaft 12 and the pawl 21 is mounted insuitable relation to said disk 20 and is provided with the spring 22which is adapted to hold the free end of said pawl 21 in the path of theabutment 23 of the ratchet disk 20.

The disk 20 is so positioned upon the shaft 12, with relation to therestraining arm 17, that when said shaft 12 is rotating in its normalcounter-clockwise direction, the abutment 23 will pass beyond the freeend of the pawl 21 just before the ledge arm 14 reaches a point in itsrotation where its movement will be arrested if the ledge 11 lies in itspath. The purpose of the ratchet disk 20 and its coacting pawl 21 is tostop the movement of the shaft 12 and parts moving therewith, due to therecoil of spring 18 after said spring has been stretched in cushioningthe blow incident to suddenly stopping the rotation of the shaft 12,within a limit which will be hereinafter more fully explained. The cams24 and 25 are fixed upon the shaft 12 and are adapted to suitablyinfluence the roller 26 for the purpose of controlling the operation ofthe propelling train, as will be hereinafter more fully pointed out indescribing the construction and arrangement of said propelling train.

The crank pin 27, punch bar 28 and link 29 are inclosed by the case 30and cover 31 (see Figs. 3 and 8). The punch bar 28 is provided at oneend with a cutting face adapted to punch the material to be perforated,which is shown as a paper tape 32 and the other end of said punch bar isslotted to receive the link 29 and is provided with a hole at rightangles to the slot for receiving the pin 33 by means of which said link29 is pivotally connected to said punch bar 29.

For convenience and economy in manufacture, the crank pin 27 ispermanently fastened in the enlarged end 34 of the shaft 12 and isarranged to operate in a hole provided therefor in one end of, link 29.The

&

spring 35 is attached to the link 29 by means of the screw 36 and thefree end of said spring is arranged to bear upon the enlarged head ofthe pin 33 and thereby hold said pin in position in the punch bar 28.The punch bar 28 is mounted in suitable openings in the case 30 so thatsaid case forms a guide through which said punch bar may freely slide,and the opening 37 in the case 30 is provided in suitable relation tothe punch bar 28 so as to guide the tape 32 in. the path of said punchbar.

The die 38 is provided with a large end or flange 39 and fitted to anopening in the case 30 which is provided in the line of motion of thepunch bar 28, a suitable shoulder being pro ided in said opening so thatone end of the die 38 maybe brought flush with the lower face of theopening 37, While preventing said die being moved far enough toward thepunch bar 28 so that its end will project into said opening 37. Adovetailed piece 40 is fitted into a suitable slot in the bottom of thecase 30 and is arranged to hold the flange 39 of the die 38 against theshoulder provided therefor in the case 30. An opening is provided in thedie 38 in the path of the punch bar 28 and suitably fitted to thecutting end of said bar, and the lower part of the die 38 is recessed toa diameter substantially larger than that of the punch bar 28 to a pointbeyond that to which the end of said punch bar 28 will be depressed uponthe rotation of the shaft 12 so that the disks detached from the tape 32may fall freely through said recess after they have been forced throughthe cutting portion of the die by the action of the punch bar 28. Anopening in line with the recess in the die 38 is provided in dovetailedpiece 40, said opening being at least as large as said recess so thatthe disks will pass freely-through said dovetailed piece 40.

The cover 31 is attached to the case 30 for the purpose of protectingthe crank pin,-

punch and link from dust and from mechanical injury and at the same timeguiding the tape in suitable relation to the punch bar 28.

It will be noted that the cutting end of the punch bart28 is normallyheld slightly above the top of the opening 37 so that the punch willalways be positively disengaged from the tape, and the cooperation ofthe ratchet disk 20 with the pawl 21 prevents the shaft 12 from backingup enough, as a result of the rebound due to the cushioning effect ofthe spring 18, to bring the punch bar 28 against the tape 32.

The pinion 13 is connected by suitable intel-mediate gearing with themain punching gear 41 which is loosely mounted upon the main shaft 42.

In the interests of clearness, the various gears and pinions are merelyindicated by dotted pitch lines.

The main spring 46 is attached at one end to the main shaft 42 and atthe other end to the main punching gear 41. The main prothe gear 47, asmore particularly described in Patent No. 726,882 to H. W. Doughty andC. E. Beach dated May 5, 1903.

. The gear 47 is arranged to drive the shafts 48 and 49 by means ofsuitable intermediate gearing. The shaft 49 carries escapement wheel 50which is adapted to engage with and operate the pallet 51 carried by thepallet shaft 52. The propelling roller 53 is also carried by the shaft49, said roller being of such diameter as to adapt it to propel the tape32, said tape being held in contact with said propelling roller by thetension roller 54 carried by the adjustable tension roller spring 55.The block 56 is provided for supporting the spring 55, said block havinga slot 57 formed .therein to act as a guide for the tape 32.

A suitable governor bar 58 (see Fig. 1) is carried by the shaft 52having thereon governdr weights 59 for regulating the speed of vibrationof the pallet 51. A toothed disk 60 is also carried by the shaft 52 anda detent arm 61 is pivoted in suitable relation to said 'disk so thatthe free end of this arm may be brought into engagement with the teethof said disk.

The relation of the arm 61 to the teeth of the disk 60 is such that saidarm may permit the disk to rotate in one direction but will act as aratchet click and prevent its rotation in the opposite direction, and asthe escapement shaft 52 oscillates rapidly it is evident that when thearm 61 moves to engage the teeth of said disk the engaging end of saidarm may bound out of said teeth momentarily, but at the same time saiddisk completes its movement in one direction and is about to start u onits return movement, it is evident that t ere is an instant during whichsaid shaft is at rest and at such instant the detent arm 61 may engagewith the teeth of said disk and prevent the resumption of itsoscillation. By the use of this form of escapement shaft detent, I amenabled to arrest the movement of the escapement shaft by an expenditureof very little energy in moving the detent arm, because I have arrangedto lock the shaft at a time when it has, of its own accord, momentarilycome to rest, and I thus am' enabled to employ a detent structure merelycapable of holding the pallet shaft structure at rest when it has, inits ordinary operation, come to rest, instead of having to provide astructure not only capable of holding the shaft at rest but capable ofabsorbing the momentum of the governor and other parts moving with saidshaft when they are in most rapid vibration.

A suitable spring 62 (see also Fig. 2 is so connected with the arm 61that when said arm has been moved nearly into engagement and so thatwhen said plate is not so moved it will be moved with-said shaft 48 withsufficient force to positively operate the detent arm 61 as hereinafterdescribed.

A link 65 is provided for connecting the plate 63 with the detentarm'61, said link having a slot 66 at one end, of such length thatWhenever the detent arm 61 has been moved by said link to such positionthat the spring 62 tends to swing. said arm 61 into engagement with thedisk 60, said slot 66 will permit the arm 61 to move into engagementwith the disk 60 without further motion of the plate 63. With thisconstruction the action of the detent in finally movmg into engagementwith the pallet shaft structure is always practically instantaneous,thereby avoiding the chattering and uncertain action heretoforeexperienced in similar detents, due to the very slight movement of I thedetent controlling structure incident to each oscillation oftheescapement structure and the consequent tendency of the escapementstructure to drive back the detent opcrating structure through therounding over of the engaging points and requiring a very strong drivingmeans for forcing the detent into the path of the escapement shaftlstrucure.

An arm 67 pivoted at 68 is arranged to connect at one end with the plate63 and at the other end with the roller 26, said arm being arranged tocarry said roller in such position with relationto the cams 24 and 25that when said cams are in the position which they occupy when the ledge15 is engaging either the ledge 10 or the ledge 11,

neither of said cams will lie within the path of the roller 26, but whensaid ledge 15 has been disengaged by the ledge 10, the counterclockwisemovement of the shaft 12 will bring the cam 25 in the path of the roller26, and if the plate 63 is not already in posltlon to cause engagementof the detent arm 61 with toothed disk 60, said cam 25 will act upon theroller 26 to cause the plate 61 to be moved to such position,'therebyassuring the stopping of the propelling train just after thecommencement of the rotation of the shaft 12. The cam 25 will further beso formed as to insure the engagement of the detent arm 61 with the diskbefore the shaft 12 has revolved far enough to cause'the punch bar 28 toforce the tape 32 against the die 38.

The cam 24 is so formed that in the normal rotation of the shaft 12,after said shaft has revolved far enough to force the cutting end of thepunch bar 28 through the tape 32 and to withdraw said punch bartherefrom, the cam 24 will engage the roller 26 and thereby so move theplate 63 as to not only withdraw the detent arm 61 from engagement withthe toothed disk 60, but in addition thereto, will move said plate 63far enough with relation to the shaft 48 so that said shaft will have totravel a distance sufficient to cause a predetermined amount of tape tobe propelled past the rollers 53 and 54 before the detent arm 61 will beso moved by the link 65 that the spring 62 will carry said arm 61 intoengagement with the teeth of disk 60, for reasons well understood bythose skilled in this art.

The operation of this recorder is as follows :Assuming that the variousparts are in the positions shown in the drawings, which is the positionsaid parts will assume when they come to rest when the magnet isdenergized, (the arrangement of the escapement mechanism ledges 10 and11 being such as to particularly adapt them for use in connection with anormally closed circuit) :If the magnet 1 is connected to a suitablenormally closed circuit, it is evident that the armature 3 will be movedto its attracted position and the ledge 11 will be withdrawn from thepath of the ledge 15 and the shaft 12 will rotate slightly, bringingsaid ledge 15 into engagement with the ledge 10. If, now, a signal betransmitted in the circuit connected to magnet 1, each time such circuitis interrupted, the armature 3 will be moved away from the magnet 1through the action of gravity (which may be supplemented by a retractilespring, which is not shown, to avoid complicating the drawing) therebymovingthe ledge 10 out of the path of the ledge 15 and leaving the shaft12 free to rotate. The rotation of the shaft 12 will carry the cam 25past the roller 26 and may slightly move the arm 67 around its pivot 68in a direction which will swing the actuating plate 63 in the directionwhich tends to move the detent arm 61 into the path of the toothed disk60, but said arm and disk being already in engagement, no movement ofsaid arm 61 will result from the cam 25 being thus carried past theroller 26. The continued rotation of the shaft 12 will cause the crankpin 27 acting through the link 29 to drive the unch bar 28 through thetape 32 and into t-e die 38 to a point where the cutting end of thepunch bar 28 will project into the recess in the underside of said die38, thereby forcin the disk thus cut from the tape 32 complete y throughsaid die and leaving said disk free to drop clear of said die.

It is evident that the shaft 12 will have made substantially half arevolution at the time when the punch bar 28 is forced to the extent ofits travel into the die 38. The continued rotation of the shaft 12 pastthis point will therefore result in withdrawing the punch bar 28 fromthe die 38 and from the tape 32, and immediately after the punch bar 28has been raised far enough to disengage it from the tape 32, the cam 24will be brought into engagement with the roller 26 and thereby swing thearm 67 to a point which will turn the actuating plate 63 far enough towithdraw the detent arm 61 from engagement with the toothed disk 60,leaving said detent arm 61 in a position from which it may be moved bythe rotation of the shaft 48 only after said shaft has rotated for, apredetermined time which should be substantially longer than theinterval between any two strokes of any signal which it is desired torecord. After the cam 24 has thus caused the roller 26 to pass out ofthe path of said cam, the movement of the shaft 12 will be arrested bythe engagement ofthe ledge 15 with the ledge 11.

It is evident that if the circuit through the magnet 1 is immediatelyclosed after any break which has caused the disengagement of the ledge10 from the ledge 15, the ensuing rotation of the shaft 12 will continueuntil the ledge 15 again engages the ledge 10, as the ledge 11 would,under these circumstances, be moved out of the path of the ledge 15before said ledge 15 was in position to engage therewith. It will alsobe seen that differing time intervals elapsing between succeeding breaksin the circuit during any signal will be represented by correspondinglydiffering distances between perforations in the tape. It will also benoted that whenever the ledge 15 is released by the ledge 10 at a timewhen the detent arm 61 is out of engagement with the toothed disk 60,the cam 25 will cause said detent arm to be brought into engagement withsaid disk and thereby arrest the rollers 53 and 54, and the tape 32propelled thereby, before the punch bar 28 has been moved to a positionwhere saidv tape 32 will be pinched between the cutting end of saidpunch bar 28 and the die 38, thus not only causing the record producedon the tape 32 to emphasize pauses or silent intervals in the signalrecorded but also guarding against the tape being torn or I caused tocatch in the die due to its being propelled at the time the punch isbeing forced through it.

Having now fully described my invention,

what I claim and desire to secure by Letters Patent of the United Statesis 1. In a signal recorder having an electromagnetically controlledpunching train, and a normally wound propelling train for material to bepunched ;detent mechanism adapted to engage said propelling train, meansfrictionally moved by the propelling train to cause engagement of thedetent with said train, and a connection whereby the running of thepunching train will actuate the frictionally moved means to alternatelycause engagement and disengagement of said detent. 4

2. In a signal recorder, electro-magnetic escapement mechanism, anormally wound punching train controlled thereby, a suitable propellingtrain for material to be perforated, detent mechanism for saidpropelling train, means whereby said detent mechanism may be operated bythe propelling train, a cam carried by the punching train and adapted torender the detent effective at certain times independent of the actionof the,

propelling train, and a second cam carried by the punchingtrain andadapted to render the detent ineffective at certain other times in spiteof the action of the propelling train.

3. In a signal recorder having a punching e train comprisingelectromagnetic escapement mechanism for releasing it for apredetermined cycle of operation, and a normally wound propelling trainfor material to be punched ;controlling means adapted to be frictionallymoved by the propelling train,

and operating means moved by the punching train and normally permittingthe controlling means to be moved by the propelling train and adapted tocause said controlling means to move the detent to engagingpositionduring each cycle of the punching train.

4. In a signal recorder, electro-magnetic escapement mechanism, anormally wound punching train controlled thereby, a suitable propellingtrain for'material to be perforated, a disk moving with a shaft of saidpropelling train, a detent .arm rotatably mounted in suitable relationto said disk and adapted to be moved to engage therewith, a spring soconnected with the detent arm as to tend to move said arm intoengagement with said disk at certain times and-so that when said detentarm is moved a predetermined distance away from the disk said springwill cease to tend to move said detent arm toward said disk, suitableactuating mechanism for said detent arm controlled by both the punchingand propelling trains, and a connection between said actuating mechanismand the detent arm arranged to permit relative movement between them.

5. In a signal recorder having a punching train comprisingelectro-magnetic escapement mechanism for releasing it for apredetermined cycle, and a normally wound propelling train for materialto be punched controlling means adapted to be frictionally moved by thepropelling train, and operating means moved by the punching train andadapted to actuate said controlling means during each cycle of thepunching train, first h to said second opening and having a punchopening therein which is substantially enlarged from the end fartherfrom the punch bar to a point passed by the end of the punch bar in theoperation thereof.

7. In a signal recorder, electro-magnetic escapement mechanism, anormally wound punching train controlled thereby and including a shaftupon which a member of the escapement mechanismis so mounted as to becapable of rotating independently thereof, a restraining arm carried bysaid shaft and arranged to suitably limit the rotation of said memberwith relation to said shaft, a suitable spring connecting said memberand said restraining arm, a ratchet carried by said shaft, a pawladapted to-engage with said ratchet and limit the rebound of said shaftwhen its rotation has been arrested by the engagement of the escapementmechanism. punch mechanism connected with said punching train, anormally wound propelling train arranged to propel material to beperforated, and detent mechanism for said propelling train controlled bysaid punching train.

8. In a signal recorder, electro-magnetic escapement mechanismcomprising a magnet and its armature, a ledge bar moved by said armatureand having a forked end, a revoluble ledge arm mounted adjacent to theledge bar, two ledges, each carried by aprong of the forked end of saidledge bar and adapted to be successively engaged by the ledge arm to.arrest the rotation thereof, a normally wound punching train having ashaft upon which the ledge arm is mounted, punch mechanism connectedwith said punching train, a normally wound propelling train arranged topropel material to be perforated, and detent mechanism for saidpropelling train controlled by said punching train.

9. In an electro-magnetically controlled signal recorder, a suitablyoperatedpunch bar, a guide case for said punch bar having therein anopening for the material to be perforated and a second opening forreceiving a suitable die, said die opening being smaller at the endnearer the punch bar than at the end farther therefrom, a die fitted tosaid die opening and having a punch opening which is substantiallyenlarged from the end farther from the punch bar to a point passed bythe end of the punch bar in the operation thereof, and a dove-tailedplate fitted to said case for retaining said die in said die opening andhaving an opening at least as large as, and registering with, 15 theenlarged end of said punch opening.

In witness whereof, I have hereunto subscribed my name, this 29th day ofMay, A. D. I914.

LEE J. VOORHEES.

Witnesses:

W. KENDALL BROWN, J. E. MARSHALL.

